A large air cooler like the K2 is similar if not better than a CLC like the H100.
Thanks honosuseri & Idleman for the answers.
I'm still a bit undecided about what case I want and have been looking at the CPU watercoolers. How are they for cooling and noise vs the K2? Having looked at the options I am happy to spend ~£100 on the CPU watercooler if it will benefit, is there one you would recommend?
Thanks again